BMW has introduced new test stands for noise measurements on passenger cars and motorcycles.Information is given on room conditions, machinery equipment, sound levels, frequency ranges and types of measurement.The semi-anechoic room is designed for measuring the sound distribution emitted by a single vehicle. Road influence is simulated by a reflecting floor and a roller-dynamometer.The free field sound distribution in terms of distance and direction is measured in the anechoic room. This room has high-precision installations for sound source identification and noise mapping.The reverberation room serves to measure sound power emitted by the test object. Its second purpose is to subject the bodywork to a high-power external sound source and to measure the sound-deadening effect of the passenger compartment.In conclusion, the presentation provides reports on the initial experience with these test facilities.
New Acoustic Test Facilities of BMW
Sae Technical Papers
SAE Surface Vehicle Noise and Vibration Conference ; 1985
1985-05-15
Aufsatz (Konferenz)
Englisch
New acoustic test facilities of BMW
Kraftfahrwesen | 1985
|An Overview of Three New Acoustic Test Facilities
British Library Online Contents | 1997
|Acoustic Design and Performance of Turbojet Test Facilities
SAE Technical Papers | 1955
|An Overview of Three New Acoustic Test Facilities
British Library Conference Proceedings | 1997
|British Library Online Contents | 1996
|